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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 731909.0, MPI für Astronomie / Publikationen_mpia
The elusive stellar halo of the Triangulum galaxy
Authors:McMonigal, B.; Lewis, G. F.; Brewer, B. J.; Irwin, M. J.; Martin, N. F.; McConnachie, A. W.; Ibata, R. A.; Ferguson, A. M. N.; Mackey, A. D.; Chapman, S. C.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:4
Start Page:4374
End Page:4388
Audience:Not Specified
Abstract / Description:The stellar haloes of large galaxies represent a vital probe of the processes of galaxy evolution. They are the remnants of the initial bouts of star formation during the collapse of the protogalactic cloud, coupled with imprint of ancient and ongoing accretion events. Previously, we have reported the tentative detection of a possible, faint, extended stellar halo in the Local Group spiral, the Triangulum galaxy (M33). However, the presence of substructure surrounding M33 made interpretation of this feature difficult. Here, we employ the final data set from the Pan-Andromeda Archaeological Survey, combined with an improved calibration and a newly derived contamination model for the region to revisit this claim. With an array of new fitting algorithms, fully accounting for contamination and the substantial substructure beyond the prominent stellar disc in M33, we reanalyse the surrounds to separate the signal of the stellar halo and the outer halo substructure. Using more robust search algorithms, we do not detect a large-scale smooth stellar halo and place a limit on the maximum surface brightness of such a feature of μV = 35.5 mag arcsec-2, or a total halo luminosity of L < 106 L.
Free Keywords:galaxies: haloes; galaxies: individual: M33; Local Group
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 %R 10.1093/mnras/stw1657
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